1 . 已知
,
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3a1792c8a27289dcabe21bdee2b92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5e7c5ff57bd768667cf19834ab0682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62d712f7ded863e7695e0133e15a15c.png)
您最近一年使用:0次
2 . 求证:(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f793af5c1407c885b5de4cadee808fe.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b43095f6edf6b8fb4f5d51dba9fa285.png)
您最近一年使用:0次
3 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d63300cd3a244536c40097959188cc.png)
您最近一年使用:0次
4 . 已知
,且
、
、
是
的三边长,试判断
的形状,并证明之.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83dd6a814dd7e75d45f9b33d79644120.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
5 . 已知
,猜想![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ab31ac2f06680b6e138b0813c8be48.png)
________
,并证明之.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991b2a6a7f1adab601b2270a42ae4a14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ab31ac2f06680b6e138b0813c8be48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d82e4c2294efbd33e1b268e9a0cec5.png)
您最近一年使用:0次